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United States Patent |
5,614,679
|
Johnson
|
March 25, 1997
|
Recessed pressure indicator regulator assembly
Abstract
A pressure indicator regulator assembly for a gas flow control device is
disclosed for indicating the pressure of gas in a container. The pressure
indicator regulator assembly includes a regulator housing integrally
formed with a gas flow control device attached to a high pressure gas
container. A tubular spiral coil pressure indicator is disposed within a
recessed notch defined by the regulator housing and is in sealed fluid
connection with the gas container through a stepped bore bushing disposed
in a stepped bore passage. A cover having a transparent outer surface is
removably attached to the housing at the notch, and forms a smooth,
essentially continuous surface with respect to the exterior surface of the
housing.
Inventors:
|
Johnson; Joseph B. (Beech Grove, IN)
|
Assignee:
|
Regin Manufacturing, Inc. (Indianapolis, IN)
|
Appl. No.:
|
534024 |
Filed:
|
September 26, 1995 |
Current U.S. Class: |
73/756; 137/557 |
Intern'l Class: |
G01L 007/00 |
Field of Search: |
137/557
73/756
|
References Cited
U.S. Patent Documents
3949966 | Apr., 1976 | Fabish.
| |
5119844 | Jun., 1992 | Cannon et al. | 137/557.
|
Primary Examiner: Chilcot; Richard
Assistant Examiner: Felber; Joseph L.
Attorney, Agent or Firm: Locke Reynolds
Claims
What is claimed is:
1. A pressure indicator regulator assembly for a gas flow control device,
the pressure indicator regulator assembly being positioned in sealed fluid
connection between a gas inlet and a gas outlet respectively defined in
the gas flow control device, the pressure indicator regulator assembly
comprising:
a regulator housing having an exterior surface and defining a gas inlet
bore, a regulator cavity, a gas outlet bore, a recessed notch and a
passage, said gas inlet bore capable of sealed fluid connection with the
gas inlet, said regulator cavity disposed fluidly connecting said inlet
bore and said outlet bore, said gas outlet bore capable of sealed fluid
connection with the gas outlet, and said passage disposed fluidly
connecting said inlet bore and said recessed notch;
a pressure indicator disposed within said notch and in sealed fluid
connection with said passage;
a pressure indicator cover having a transparent surface formed to
substantially correspond to said exterior surface proximate to said notch;
and
means for removably attaching said cover within said notch so that said
transparent surface and said exterior surface form a generally smooth,
continuous surface.
2. A pressure indicator regulator assembly for a gas flow control device as
defined in claim 1, wherein:
said regulator housing defines a plurality of slots disposed within said
notch; and
said means for removably attaching said cover within said notch comprises a
plurality of arms, each arm having a projecting finger, said arms flexibly
and resiliently attached to said cover whereby said cover is removably
attachable to said regulator housing within said notch by flexing said
arms with respect to said cover and disposing each of said fingers within
one of said slots.
3. A pressure indicator regulator assembly for a gas flow control device as
defined in claim 2, wherein said exterior surface is generally
cylindrical.
4. A pressure indicator regulator assembly for a gas flow control device as
defined in claim 3, wherein said pressure indicator comprises:
a tubular coil having a closed first end and an open second end, said coil
disposed to form a flexible, generally planar spiral with said first end
proximate to the circumferential edge of said coil and said second end
proximate to the center of said coil;
a connecting tube, disposed through said passage and attached between said
second end and said regulator housing whereby sealed fluid connection is
made between said inlet bore and said coil, and variations in fluid
pressure in said inlet bore cause variations in the diameter of the planar
spiral formed by said coil, producing movement of said first end;
a pointer attached to said coil proximate to said first end; and
indicia disposed proximate to said pointer.
5. A pressure indicator regulator assembly for a gas flow control device as
defined in claim 3, wherein said pressure indicator comprises:
a tubular coil having a closed first end and an open second end, said coil
disposed to form a flexible, generally planar spiral with said first end
proximate to the circumferential edge of said coil and said second end
proximate to the center of said coil;
a bushing defining an orifice, said bushing disposed within said passage;
a seal means whereby sealed fluid connection is made between said orifice
and said passage;
a connecting tube attached between said second end and said orifice whereby
sealed fluid connection is made between said bushing and said coil, and
variations in fluid pressure in said inlet bore Cause variations in the
diameter of the planar spiral formed by said coil, producing movement of
said first end;
a pointer attached to said coil proximate to said first end; and
an indicia plate attached to said regulator housing within said notch and
disposed proximate to said pointer.
6. A pressure indicator regulator assembly for a gas flow control device,
the pressure indicator regulator assembly being positioned in sealed fluid
connection between a gas inlet and a gas outlet respectively defined in
the gas flow control device, the pressure indicator regulator assembly
comprising:
a regulator housing having a generally cylindrical exterior surface and
defining a gas inlet bore, a regulator cavity, a gas outlet bore, a
recessed notch and a passage, said gas inlet bore capable of sealed fluid
connection with the gas inlet, said regulator cavity disposed fluidly
connecting said inlet bore and said outlet bore, said gas outlet bore
capable of sealed fluid connection with the gas outlet, and said passage
disposed fluidly connecting said inlet bore and said recessed notch;
a pressure indicator disposed within said notch and in sealed fluid
connection with said passage;
a pressure indicator cover having a transparent outer surface formed as a
portion of a cylindrical surface having radius substantially the same as
the radius of said regulator housing, the dimensions of said cover chosen
so that said cover is capable of engaging said notch with the axis defined
by said outer surface coaxial with the axis defined by said regulator
housing, said outer surface and the exterior of said regulator housing
forming a generally smooth, continuous cylindrical surface; and
means for removably attaching said cover within said notch.
7. A pressure indicator regulator assembly for a gas flow control device as
defined in claim 6, wherein:
said regulator housing defines a plurality of slots disposed with said
notch; and
said means for removably attaching said cover within said notch comprises a
plurality of arms, each arm having a projecting finger, said arms flexibly
and resiliently attached to said cover whereby said cover is removably
attachable to said regulator housing within said notch by flexing said
arms with respect to said cover and disposing each of said fingers within
one of said slots.
8. A pressure indicator regulator assembly for a gas flow control device as
defined in claim 7, wherein said pressure indicator comprises:
a tubular coil having a closed first end and an open second end, said coil
disposed to form a flexible, generally planar spiral with said first end
proximate to the circumferential edge of said coil and said second end
proximate to the center of said coil;
a seal;
a connecting tube attached to said second end and removably attached to
said regulator housing with said seal interposed between said tube and
said regulator housing whereby sealed fluid connection is made between
said inlet bore and said coil, and variations in fluid pressure in said
inlet bore cause variations in the diameter of the planar spiral formed by
said coil, producing movement of said first end in the plane defined by
said coil;
a pointer attached to said coil proximate to said first end; and
an indicia plate attached to said regulator housing within said notch and
disposed proximate to said pointer.
9. A pressure indicator regulator assembly for a gas flow control device as
defined in claim 7, wherein:
said passage is formed to define a stepped-bore including a smaller inner
passage disposed proximate to said inlet bore and a larger outer passage
disposed proximate to said notch, and a passage annular shoulder
interposed between said inner and outer passages; and
said pressure indicator includes
a tubular coil having a closed first end and an open second end, said coil
disposed to form a flexible, generally planar spiral with said first end
proximate to the circumferential edge of said coil and said second end
proximate to the center of said coil;
a bushing defining a bushing annular shoulder and a stepped-bore orifice
including a smaller inner orifice and a larger outer orifice, said bushing
annular shoulder disposed exterior to said bushing and proximate to said
inner orifice, and said bushing disposed within said outer passage so that
said inner orifice is proximate to said inlet bore;
an O-ring disposed around said bushing at said bushing annular shoulder and
bearing against said passage annular shoulder so that sealed fluid
connection is made between said bushing and said passage;
a connecting tube, partially disposed within said stepped-bore orifice, and
attached between said second end and said bushing whereby sealed fluid
connection is made between said bushing and said coil, and variations in
fluid pressure in said inlet bore cause variations in the diameter of the
planar spiral formed by said coil, producing movement of said first end;
a pointer attached to said coil proximate to said first end; and
an indicia plate attached to said regulator housing within said notch and
disposed proximate to said pointer.
10. A pressure indicator regulator assembly for a gas flow control device
as defined in claim 7, wherein said pressure indicator comprises:
a tubular coil having a closed first end and an open second end, said coil
disposed to form a flexible, generally planar spiral with said first end
proximate to the circumferential edge of said coil and said second end
proximate to the center of said coil;
a connecting tube, disposed through said passage and attached between said
second end and said regulator housing whereby sealed fluid connection is
made between said inlet bore and said coil, and variations in fluid
pressure in said inlet bore cause variations in the diameter of the planar
spiral formed by said coil, producing movement of said first end in the
plane defined by said coil;
a pointer attached to said coil proximate to said first end; and
indicia disposed proximate to said pointer.
11. A pressure indicator regulator assembly for a gas flow control device
as defined in claims 10 wherein said indicia includes:
an indicia plate; and
means for removably attaching said indicia plate to said regulator housing
within said notch.
12. A pressure indicator regulator assembly for a gas flow control device,
the pressure indicator regulator assembly being positioned in sealed fluid
connection between a gas inlet and a gas outlet respectively defined in
the gas flow control device, the pressure indicator regulator assembly
comprising:
a generally cylindrical regulator housing defining a gas inlet bore, a
regulator cavity, a gas outlet bore, a recessed notch and a passage, said
gas inlet bore capable of sealed fluid connection with the gas inlet, said
regulator cavity disposed fluidly connecting said inlet bore and said
outlet bore, said gas outlet bore capable of sealed fluid connection with
the gas outlet, said notch defining a partial disk-shaped volume formed by
a generally planar rectangular rear surface, a generally planar arched
first end surface and a generally planar arched second end surface, with
said rear surface disposed generally parallel to the axis defined by said
housing and said first and second end surfaces disposed adjacent to
opposing edges of and normal to said rear surface, and said passage
disposed fluidly connecting said inlet bore and said rear surface;
a pressure indicator disposed within said notch and in sealed fluid
connection with said passage;
a partial disk-shaped pressure indicator cover having a transparent,
rounded generally outer surface, a generally planar arched first side
surface, and a generally planar arched second side surface, the radius of
said outer surface substantially the same as the radius of said regulator
housing, and said first and second side surfaces disposed adjacent to
opposing edges and normal to the axis of said outer surface, the
dimensions of said cover chosen so that said cover may engage said notch
with the axis defined by said outer surface generally coaxial with the
axis defined by said regulator housing, said first side surface disposed
adjacent to said first end surface, and said second side surface disposed
adjacent to said second end surface, said outer surface and the exterior
of said regulator housing thereby forming a generally smooth, continuous
cylindrical surface; and
means for removably attaching said cover within said notch.
13. A pressure indicator regulator assembly for a gas flow control device
as defined in claim 12, wherein:
said first and second end surfaces each defines at least one slot;
said first and second side surfaces each defines at least one recessed
channel; and
said means for removably attaching said cover within said notch comprises
at least a pair of arms, each arm having a projecting finger, at least one
of said arms flexibly and resiliently attached to each of said first and
second side surfaces proximate to said channels whereby said cover is
removably attachable to said regulator housing within said notch by
flexing said arms with respect to said cover and disposing each of said
fingers within one of said slots.
14. A pressure indicator regulator assembly for a gas flow control device
as defined in claim 13, wherein said pressure indicator comprises:
a flattened tubular coil having a closed first end and an open second end,
said coil disposed to form a flexible, generally planar spiral with said
first end proximate to the circumferential edge of said coil and said
second end proximate to the center of said coil;
a seal;
a connecting tube attached to said second end and removably attached to
said regulator housing with said seal interposed between said tube and
said regulator housing whereby sealed fluid connection is made between
said inlet bore and said coil, and variations in fluid pressure in said
inlet bore cause variations in the diameter of the planar spiral formed by
said coil, producing movement of said first end in the plane defined by
said coil;
a pointer attached to said coil proximate to said first end; and
an indicia plate attached to said regulator housing within said notch and
disposed proximate to said pointer.
15. A pressure indicator regulator assembly for a gas flow control device
as defined in claim 13, wherein:
said passage is formed to define a stepped-bore including a smaller inner
passage disposed proximate to said inlet bore and a coaxial larger outer
passage disposed proximate to said notch, and a passage annular shoulder
interposed between said inner and outer passages; and
said pressure indicator includes:
a flattened tubular coil having a closed first end and an open second end,
said coil disposed to form a flexible, generally planar spiral with said
first end proximate to the circumferential edge of said coil and said
second end proximate to the center of said coil;
a bushing defining a bushing annular shoulder and a stepped-bore orifice
including a smaller inner orifice and a coaxial larger outer orifice, said
bushing annular shoulder disposed exterior to said bushing and proximate
to said inner orifice, and said bushing disposed within said outer passage
so that said inner orifice is proximate to said inlet bore;
an O-ring disposed around said bushing at said bushing annular shoulder and
bearing against said passage annular shoulder so that sealed fluid
connection is made between said bushing and said passage;
a connecting tube, partially disposed within said stepped-bore orifice, and
attached to said second end and said bushing whereby sealed fluid
connection is made between said bushing and said coil, and variations in
fluid pressure in said inlet bore cause variations in the diameter of the
planar spiral formed by said coil, producing movement of said first end in
the plane defined by said coil;
a pointer attached to said coil proximate to said first end; and
an indicia plate attached to said regulator housing within said notch and
disposed proximate to said pointer.
16. A pressure indicator regulator assembly for a gas flow control device
as defined in claim 13, wherein said pressure indicator comprises:
a flattened tubular coil having a closed first end and an open second end,
said coil disposed to form a flexible, generally planar spiral with said
first end proximate to the circumferential edge of said coil and said
second end proximate to the center of said coil;
a connecting tube, disposed through said passage and attached between said
second end and said regulator housing whereby sealed fluid connection is
made between said inlet bore and said coil, and variations in fluid
pressure in said inlet bore cause variations in the diameter of the planar
spiral formed by said coil, producing movement of said first end in the
plane defined by said coil;
a pointer attached to said coil proximate to said first end; and
indicia disposed proximate to said pointer.
17. A pressure indicator regulator assembly for a gas flow control device
as defined in claims 16 wherein said indicia includes:
an indicia plate; and
means for removably attaching said indicia plate to said rear surface.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to the field of gas flow control
devices, and more particularly concerns a pressure indicator regulator
assembly for a gas flow control device for displaying the pressure of a
contained gas, such as therapeutic oxygen.
2. Description of the Prior Art
With respect to the use of gas stored in a high pressure container, for
instance, therapeutic oxygen in a cylinder stored at 500-2000 p.s.i.g., it
is frequently desirable to deliver the gas at a constant flow rate as may
be determined by medical or other requirements. Such flow rate may vary
from as little as 0.25 liters per minute to greater than 15 liters per
minute. In such circumstances, it is necessary to reduce the high pressure
of the contained gas to a regulated, essentially lower constant pressure
suitable for delivery at a predetermined flow rate.
Available regulators for gas flow control devices frequently include a
pressure indicator that is threadably attached to and in fluid connection
with the regulator so as to display gas pressure, and is disposed to
project from the main body of the gas flow control device. As a result of
such pressure indicators projecting from the gas flow control device,
there is a tendency for hoses connected to the gas flow control device to
become caught upon or looped around the pressure indicators, thereby
interfering with the proper flow of the gas. Further, such projecting
pressure indicators are subject to collision with foreign objects
resulting in damage to the pressure indicator, the regulator, or the gas
flow control device, especially during movement of the gas flow control
device.
Despite the availability of such regulators and pressure indicators, there
exists a need in the art for a pressure indicator regulator assembly for
use with a gas flow control device that is capable of indicating the
pressure of gas, yet has a regulator and a pressure indicator formed as an
assembly that does not project from the body of the gas flow control
device.
SUMMARY OF THE INVENTION
In order to aid in the understanding of the present invention, it can be
stated in essentially summary form that it is directed to a pressure
indicator regulator assembly that is capable of use with a gas flow
control device to display the pressure of gas, with the pressure indicator
portion formed adjacent to the regulator portion without projecting from
the main body of the gas flow control device.
More specifically, the present invention is directed to a pressure
indicator regulator assembly for a gas flow control device suitable for
attachment to an oxygen cylinder or other high pressure source of gas. The
gas flow control device includes a body of generally cylindrical form,
with attachment of the body to an oxygen or similar high pressure cylinder
by an integral, generally U-shaped yoke that is bored and tapped to
receive a clamp screw having a handle. The gas flow control device also
includes a flow control valve having a control knob for adjusting the gas
flow at a predetermined rate.
The pressure indicator regulator assembly of the present invention includes
a regulator housing having a generally cylindrical exterior surface. The
regulator housing is integrally formed with the body, defining a gas inlet
bore, a regulator cavity, a gas outlet bore, a recessed notch and a
passage. The pressure indicator regulator assembly is positioned for
sealed fluid connection between the gas inlet bore and the gas outlet
bore. The gas inlet bore provides for sealed fluid connection, upon
tightening of the clamp screw, with the conventional outlet of the gas
cylinder to which the gas flow control device is secured, thereby
admitting gas at high pressure to the gas flow control device. The gas
inlet bore includes a larger bore proximate to the yoke, a coaxial
intermediate bore opening into the passage, and a coaxial smaller bore
proximate to the regulator cavity. An annular valve seat protrudes into
the regulator cavity a small distance to facilitate sealed fluid
connection with a gas flow regulator. Disposed proximate to the outlet
bore is the flow control valve. The notch defines a partial disk-shaped
volume formed by a generally planar rectangular rear surface, a generally
planar arched first end surface, and a generally planar arched second end
surface. The rear surface has opposing, shorter rear surface first and
second edges, and is disposed with rear surface first and second edges
generally parallel to the axis defined by the regulator housing. Opposing
first and second end surfaces are disposed between the rear surface first
and second edges and normal to the rear surface, with the passage
connecting the intermediate bore with the rear surface. The regulator
housing defines a pair of opposing grooves disposed parallel to the body,
with one groove proximate to each of the rear surface first and second
edges. The regulator housing also defines a pair of opposing slots, one
slot disposed proximate to each of the first and second end surfaces. The
passage is formed as a stepped-bore including a smaller inner passage
disposed proximate to the gas inlet bore and a coaxial larger outer
passage disposed proximate to the notch, with a passage annular shoulder
interposed between the inner passage and the outer passage. The gas flow
regulator is disposed within the regulator cavity and is maintained in
sealed fluid connection between the inlet bore and the outlet bore.
A pressure indicator is disposed within the notch and is maintained in
sealed fluid connection with the passage. The pressure indicator includes
a flattened tubular coil having a closed first end and an open second end,
with the coil disposed to form a flexible, generally planar spiral with
the first end proximate to the circumferential edge of the coil and the
second end proximate to the center of the coil. A bushing defines a
stepped-bore orifice including a smaller inner orifice, a coaxial larger
outer orifice, and a coaxial exterior bushing annular shoulder disposed at
the end of the bushing proximate to the inner orifice. The bushing is
located within the outer passage so that the inner orifice is proximate to
the inlet bore. An O-ring is disposed around the bushing at the bushing
annular shoulder and bears against the passage annular shoulder, making
sealed fluid connection between the bushing and the passage. A connecting
tube is partially disposed through the stepped-bore orifice and is
attached between the second end and the bushing so that sealed fluid
connection is made between the bushing and the coil. A pointer is attached
to the coil proximate to the first end, and an indicia plate is removably
attached to the rear surface proximate to the pointer by a pair of
threaded fasteners, each disposed in a tapped hole. As a result of the
sealed fluid connections, variations in fluid pressure in the gas inlet
bore cause variations in the diameter of the planar spiral formed by the
coil, producing movement of the pointer with respect to the indicia plate
by movement of the first end in the plane defined by the coil.
A partial disk-shaped pressure indicator cover includes a transparent,
rounded outer surface having opposing outer surface first and second
edges, a generally planar arched first side surface and a generally planar
arched second side surface. The radius of the outer surface is
substantially the same as the radius of the regulator housing, and the
first and second side surfaces are disposed adjacent to opposing edges of
and normal to the axis of the outer surface. First and second side
surfaces each defines a recessed channel and each includes an arm flexibly
and resiliently formed with the first and second side surfaces proximate
to the channels. A projecting finger is integrally formed with each of the
arms, and a pair of ribs integrally formed with pressure indicator cover
are disposed with one rib proximate to and parallel with each of the outer
surface first and second edges. The dimensions of the cover are chosen so
that the cover is capable of engaging the notch with the axis defined by
the outer surface coaxial with the axis defined by the regulator housing,
the first side surface disposed adjacent to the first end surface, and the
second side surface disposed adjacent to the second end surface. In this
way, the outer surface and the exterior of the regulator housing may be
disposed to form a generally smooth, continuous cylindrical surface. The
cover may be positioned with the arms disposed so that the fingers are
proximate to the slots and the ribs are proximate to the grooves, whereby
the cover may be removably attached to the regulator housing within the
notch by flexion of the arms with respect to the cover, with each finger
disposed within one of the slots and each rib disposed within one of the
grooves.
The present invention is of compact and streamlined design, with the
pressure indicator capable of displaying the pressure of gas in the high
pressure cylinder without projecting from the main body of the gas flow
control device. Consequently, the propensity for hoses connected to the
gas flow control device to become caught upon or looped around the
pressure indicator is minimized, and the potentiality for collisional
damage to the pressure indicator and the gas flow control device is
lessened.
In use, the gas flow control device is removably attached to an oxygen or
similar high pressure cylinder at the yoke by tightening the clamp screw
using the handle, whereby gas may enter the present invention through the
gas inlet bore. By virtue of sealed fluid connections between the gas
inlet bore, the passage, the bushing, the connecting tube, and the coil,
variations in gas pressure within the high pressure gas cylinder causes
variations in pressure of gas present within the coil. As a result of the
flexibility of the coil, the spiral defined by the coil slightly wraps or
unwraps in response to decreases or increases in the gas pressure, whereby
the pointer is caused to move in the path of an arc with respect to the
indicia plate. In this way, the pressure of gas within the high pressure
cylinder may be ascertained by observation through the transparent outer
surface. In order to provide adjustment or service to the pressure
indicator, the cover may be removed from the notch by inserting a bladed
object such as a screwdriver into the channels and bearing against the
arms, thereby disengaging the fingers from the slots.
It is an object of the present invention to provide a pressure indicator
regulator assembly for a gas flow control device that is of streamlined,
compact design that minimizes the likelihood that hoses connected to the
gas flow control device become caught upon or looped around the pressure
indicator.
It is another object of the present invention to provide a pressure
indicator regulator assembly for a gas flow control device that is of
streamlined, compact design the minimizes likelihood that a projecting
pressure indicator will be subject to collision with foreign objects.
It is another object of the present invention to provide a pressure
indicator regulator assembly for a gas flow control device that is capable
of accurately and reliably indicating the pressure present in a high
pressure gas container.
It is yet another object of the present invention to provide a pressure
indicator regulator assembly for a gas flow control device that is sturdy,
durable and reliable, yet may be easily and quickly maintained and
serviced.
Further objects and advantages of the present invention will be apparent
from a study of the following portion of the specification, the claims,
and the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of a pressure indicator regulator
assembly representing the present invention.
FIG. 2 is a perspective view of a pressure indicator regulator assembly
representing the present invention.
FIG. 3 is an enlarged sectional view of a pressure indicator regulator
assembly representing the present invention, taken along line 3--3 of FIG.
2.
FIG. 4 is an enlarged sectional view of a pressure indicator regulator
assembly representing the present invention, taken along line 4--4 of FIG.
2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The following portion of the specification, taken in conjunction with the
drawings, sets forth the preferred embodiment of the present invention.
The embodiment of the invention disclosed herein is the best mode
contemplated by the inventor for carrying out his invention in a
commercial environment, although it should be understood that various
modifications can be accomplished within the parameters of the present
invention.
Referring now to the drawings for a detailed description of the present
invention, reference is first made to FIGS. 1-2, generally depicting gas
flow control device 10 suitable for attachment to an oxygen cylinder, not
shown, or other high pressure source of gas. Gas flow control device 10
includes body 12 of generally cylindrical form. Body 12 is provided with a
generally U-shaped yoke 14 that defines threaded yoke bore 15 for
threadably receiving a clamp screw and handle, not shown, for attachment
of gas flow control device 10 to the oxygen or similar high pressure gas
cylinder. Disposed proximate to control end 16 of gas flow control device
10 is a flow control valve means, not shown, having a control knob for
adjusting gas flow control device 10 to deliver a predetermined rate of
gas flow.
With reference to FIGS. 1-4, depicted generally at 20 is the pressure
indicator regulator assembly for gas flow control device 10 of the present
invention. Pressure indicator regulator assembly 20 includes regulator
housing 22 integrally formed with body 12, having generally cylindrical
exterior surface 23, and defining gas inlet bore 24, regulator cavity 26,
gas outlet bore 28, recessed notch 30 and passage 32. Pressure indicator
regulator assembly 20 is positioned for sealed fluid connection between
gas inlet bore 24 and gas outlet bore 28. Gas inlet bore 24 provides fluid
connection, upon tightening of the clamp screw, with the conventional
outlet of the gas cylinder to which gas flow control device 10 is secured,
thereby admitting gas at high pressure to gas flow control device 10. Gas
inlet bore 24 is formed as a three-section coaxial stepped bore, including
larger bore 34 proximate to yoke 14, intermediate bore 35 fluidly
connecting with passage 32, and smaller bore 36 opening to regulator
cavity 26. Annular valve seat 38 protrudes into regulator cavity 26 by a
small distance to effectuate sealed fluid connection between a gas flow
regulator, not shown, and inlet bore 24. Notch 30 defines a partial
disk-shaped volume formed by generally planar rectangular rear surface 42,
generally planar arched first end surface 45 and generally planar arched
second end surface 46. Rear surface 42 has opposing, shorter rear surface
first and second edges 43 and 44, and is disposed with rear surface first
and second edges 43 and 44 generally parallel to the axis defined by
regulator housing 22. Opposing first and second end surfaces 45 and 46,
respectively, are disposed between rear surface first and second edges 43
and 44 and normal to rear surface 42. Passage 32 is disposed fluidly
connecting intermediate bore 35 with rear surface 42. Regulator housing 22
defines a pair of opposing grooves 47 disposed parallel to body 12 with
one groove 47 proximate to each of rear surface first and second edges 43
and 44. Regulator housing 22 also defines a pair of opposing slots 49,
with one slot 49 disposed at each of first and second end surfaces 45 and
46. Passage 32 is formed to define a stepped-bore including smaller inner
passage 50 disposed proximate to gas inlet bore 24, and coaxial larger
outer passage 52 disposed proximate to notch 30, with passage annular
shoulder 54 interposed between inner passage 50 and outer passage 52. The
gas flow regulator is disposed within regulator cavity 26 and is
maintained in sealed fluid connection between inlet bore 24 and outlet
bore 28.
As depicted in FIGS. 2-4, pressure indicator 60 is disposed within notch 30
and is maintained in sealed fluid connection with passage 32. Pressure
indicator includes flattened tubular coil 62 having closed first end 64
and open second end 66, with coil 62 disposed to form a flexible,
generally planar spiral with first end 64 proximate to the circumferential
edge of coil 62 and second end 66 proximate to the center of coil 62.
Bushing 68 defines stepped-bore orifice 72, including smaller inner
orifice 74, larger outer orifice 76, and bushing annular shoulder 77
disposed at an end of busing 68 proximate to inner orifice 74. Bushing 68
is located within outer passage 52 so that inner orifice 74 is proximate
to inlet bore 24. O-ring 78 is disposed around busing 68 at bushing
annular shoulder 77 and bears against passage annular shoulder 54 so that
sealed fluid connection may be made between bushing 68 and passage 32.
Connecting tube 80 is partially disposed through stepped-bore orifice 72
and is attached between second end 66 and bushing 68 so that sealed fluid
connection is made between bushing 68 and coil 62. In this way, variations
in fluid pressure in gas inlet bore 24 cause variations in the diameter of
the planar spiral formed by coil 62, producing movement of first end 64 in
the plane defined by coil 62. Pointer 82 is attached to coil 62 proximate
to first end 64, and indicia plate 84 is removably attached to rear
surface 42 proximate to pointer 82 by a pair of threaded fasteners 86,
each disposed in a tapped hole 88.
As seen in FIGS. 1-4, partial disk-shaped pressure indicator cover 94
includes transparent, rounded outer surface 96 having outer surface first
edge 97 and outer surface second edge 98, generally planar arched first
side surface 99 and generally planar arched second side surface 100. The
radius of outer surface 96 is substantially the same as the radius of
regulator housing 22, and first and second side surfaces 99 and 100 are
disposed adjacent to opposing edges of and normal to the axis of outer
surface 96. First and second surfaces 99 and 100 each defines a recessed
channel 102 and includes an arm 104 flexibly and resiliently formed with
first and second side surfaces 99 and 100 proximate to channels 102. A
projecting finger 106 is integrally formed with each arm 104. A pair of
ribs 108 integrally formed with pressure indicator cover 94 are disposed
with one rib 108 proximate to and parallel with each of outer surface
first and second edges 97 and 98. The dimensions of cover 94 are chosen so
that cover 94 is capable of engaging notch 30 with the axis defined by
outer surface 96 coaxial with the axis defined by regulator housing 22,
first side surface 99 disposed adjacent to first end surface 45, and
second side surface 100 disposed adjacent to second end surface 46, so
that outer surface 96 and the exterior of regulator housing 22 may be
disposed to form a generally smooth, continuous cylindrical surface. Cover
94 may be positioned with arms 104 disposed so that fingers 106 are
proximate to slots 49 and ribs 108 are proximate to grooves 47, whereby
cover 94 may be removably attached to regulator housing 22 within notch 30
by flexion of arms 104 with respect to cover 94, with each finger 106
disposed within one of slots 49 and each rib 108 disposed within one of
grooves 47.
The present invention is seen to be compact and of relatively streamlined,
modern design with pressure indicator 60 capable of displaying the
pressure of gas in the high pressure cylinder without projecting from body
12 of gas flow control device 10. Consequently, the tendency for hoses
connected to gas flow control device 10 to become caught upon or looped
around pressure indicator 60, interfering with the proper flow of the gas,
is eliminated by the present invention. Further, by virtue of the
streamlined construction of the present invention, and disposition within
recessed notch 30 and cover 94, the potentiality for collisional damage to
pressure indicator 60 and gas flow control device 10 is greatly lessened.
In use, gas flow control device 10 is removably attached to an oxygen or
similar high pressure cylinder proximate to yoke 14 by tightening the
clamp screw using the handle, whereby gas may enter the present invention
through gas inlet bore 24. By virtue of the sealed fluid connections
between gas inlet bore 24, passage 32, bushing 68, connecting tube 80, and
coil 62, variations in gas pressure within the high pressure gas cylinder
causes variations in pressure of gas present within coil 62. As a result
of the flexibility of coil 62, the spiral defined by coil 62 slightly
wraps or unwraps in response to decreases or increases in the gas
pressure, whereby pointer 82 is caused to move in the path of an arc with
respect to indicia plate 84. In this way, the pressure of gas within the
high pressure cylinder may be ascertained by observation through
transparent outer surface 96. In order to provide adjustment or service to
pressure indicator 60, cover 94 may be removed from notch 30 by inserting
a bladed object such as a screwdriver into channels 102 and bearing
against arms 104, thereby disengaging fingers 106 from slots 49.
The present invention having been described in its preferred embodiment, it
is clear that the present invention is susceptible to numerous
modifications and embodiments within the ability of those skilled in the
art and without the exercise of the inventive faculty. Accordingly, the
scope of the present invention is defined as set forth by the scope of the
following claims.
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